go.mod,go.toolchain.rev: bump golang.org/x/net, Go toolchain

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* golang.org/x/net: v0.59.0 to v0.60.0
* Go toolchain: https://github.com/tailscale/go/compare/24ee2fd0610e6c505ee4ec061a81215afe119d1f...509d1573c1cafe9b210180e4ce87f44a409edbba
* golangci-lint: v2.13.2 to v2.14.0, for Go 1.27.2's export data version 5

Also fix testcontrol's serveC2N to read the whole c2n response before
returning, as x/net v0.60.0's http2 server now closes the request body
when the handler returns.

Triggered by @bradfitz via the bumpdep workflow.

Updates #21723

Signed-off-by: Dep Updater <noreply+dep-updater@tailscale.com>

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